/*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  
  package io.netty.handler.codec.mqtt;
  
  import io.netty.buffer.ByteBuf;
  import io.netty.handler.codec.DecoderResult;
  
  /**
   * Utility class with factory methods to create different types of MQTT messages.
   */
  public final class MqttMessageFactory {
  
      public static MqttMessage newMessage(MqttFixedHeader mqttFixedHeader, Object variableHeader, Object payload) {
          switch (mqttFixedHeader.messageType()) {
              case CONNECT :
                  return new MqttConnectMessage(
                          mqttFixedHeader,
                          (MqttConnectVariableHeader) variableHeader,
                          (MqttConnectPayload) payload);
  
              case CONNACK:
                  return new MqttConnAckMessage(mqttFixedHeader, (MqttConnAckVariableHeader) variableHeader);
  
              case SUBSCRIBE:
                  return new MqttSubscribeMessage(
                          mqttFixedHeader,
                          (MqttMessageIdVariableHeader) variableHeader,
                          (MqttSubscribePayload) payload);
  
              case SUBACK:
                  return new MqttSubAckMessage(
                          mqttFixedHeader,
                          (MqttMessageIdVariableHeader) variableHeader,
                          (MqttSubAckPayload) payload);
  
              case UNSUBACK:
                  return new MqttUnsubAckMessage(
                          mqttFixedHeader,
                          (MqttMessageIdVariableHeader) variableHeader,
                          (MqttUnsubAckPayload) payload);
  
              case UNSUBSCRIBE:
                  return new MqttUnsubscribeMessage(
                          mqttFixedHeader,
                          (MqttMessageIdVariableHeader) variableHeader,
                          (MqttUnsubscribePayload) payload);
  
              case PUBLISH:
                  return new MqttPublishMessage(
                          mqttFixedHeader,
                          (MqttPublishVariableHeader) variableHeader,
                          (ByteBuf) payload);
  
              case PUBACK:
                  //Having MqttPubReplyMessageVariableHeader or MqttMessageIdVariableHeader
                  return new MqttPubAckMessage(mqttFixedHeader, (MqttMessageIdVariableHeader) variableHeader);
              case PUBREC:
              case PUBREL:
              case PUBCOMP:
                  //Having MqttPubReplyMessageVariableHeader or MqttMessageIdVariableHeader
                  return new MqttMessage(mqttFixedHeader, variableHeader);
  
              case PINGREQ:
              case PINGRESP:
                  return new MqttMessage(mqttFixedHeader);
  
              case DISCONNECT:
              case AUTH:
                  //Having MqttReasonCodeAndPropertiesVariableHeader
                  return new MqttMessage(mqttFixedHeader,
                          variableHeader);
  
              default:
                  throw new IllegalArgumentException("unknown message type: " + mqttFixedHeader.messageType());
          }
      }
  
      public static MqttMessage newInvalidMessage(Throwable cause) {
          return new MqttMessage(null, null, null, DecoderResult.failure(cause));
      }
  
      public static MqttMessage newInvalidMessage(MqttFixedHeader mqttFixedHeader, Object variableHeader,
                                                  Throwable cause) {
          return new MqttMessage(mqttFixedHeader, variableHeader, null, DecoderResult.failure(cause));
      }
 
     private MqttMessageFactory() { }
 }